Otto shows the Confalones how to round numbers up or down using spaghetti and meatballs.

Content Standard(s):

Mathematics MA2019 (2019) Grade: 3

10. Identify the nearest 10 or 100 when rounding whole numbers, using place value understanding.

Unpacked Content

Evidence Of Student Attainment:

Students:
When given two-digit or three-digit number to round to the nearest 10 or 100,

Identify the ten or hundreds that the number falls between.

Plot the number on a number line between the tens or hundreds.

Identify the nearest ten or hundred and justify the answer.

Identify a possible value of the unknown number when instructed that an unknown number will round to a given number when rounding to the nearest 10 or 100.

Example: An unknown number will round to 340 when rounded to the nearest 10. Identify a possible value for the unknown number.

Teacher Vocabulary:

Place value

Round

Nearest 10

Nearest 100

Benchmark number

Midpoint

Knowledge:

Students know:

Values of the digits in the ones, tens, and hundreds places.

How to determine what is halfway between two multiples of 10 or 100.

Strategies for rounding to the nearest 10 or 100.

Use place value vocabulary and logical reasoning to justify solutions when rounding.

Skills:

Students are able to:

Round whole numbers to the nearest 10 or 100.

Identify a possible value for a number which will result in a given number rounded to the nearest 10 or 100. Example: What value will result in 270 when rounded to the nearest 10? Identify the possible values.

Understanding:

Students understand that:

rounding is determining which ten or hundred a number is closer to.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.3.10.1: Define rounding.
M.3.10.2: Round whole numbers from 100 to 999 using whole numbers from 10 to 99.
M.3.10.3: Model rounding whole numbers to the nearest 100.
M.3.10.4: Round whole numbers from 10 to 99 using whole numbers from 1 to 9.
M.3.10.5: Model rounding whole numbers to the nearest 10.
M.3.10.6: Identify the steps in rounding two- and three-digit numbers. Example: Identify the digit that may change and the number to the right.
M.3.10.7: Round whole numbers from 1 to 9 and model to show proficiency.
M.3.10.8: Understand that the two digits of a two-digit number represent amounts of tens and ones.
M.3.10.9: Match the number in the ones, tens, and hundreds position to a pictorial representation or manipulative of the value.

Prior Knowledge Skills:

Determine the value of the number in the ones, tens and hundreds place.

Recognize the place value of ones, tens and hundreds.

Alabama Alternate Achievement Standards

AAS Standard: M.AAS.3.10 Using vocalization, sign language, augmentative communication, or assistive technology use concrete materials and pictorial models to model whole numbers.